README.md: update leaderboard

commit generated automatically from
https://github.com/fxnn/adventofcode2024/actions/runs/12393826323

Author: fxnn

README.md

@@ -5,7 +5,7 @@ See https://adventofcode.com/2024
 
 [//]: # (LEADERBOARD_BEGIN)
 
-> user **fxnn** (14 stars, last one at 2024-12-09T23:23:00Z)
+> user **fxnn** (15 stars, last one at 2024-12-18T13:19:24Z)
 
 [//]: # (LEADERBOARD_END)